android_kernel_oneplus_msm8998/net/bridge
daniel 688feac489 Bridge: Fix ipv6 mc snooping if bridge has no ipv6 address
[ Upstream commit 0888d5f3c0f183ea6177355752ada433d370ac89 ]

The bridge is falsly dropping ipv6 mulitcast packets if there is:
 1. No ipv6 address assigned on the brigde.
 2. No external mld querier present.
 3. The internal querier enabled.

When the bridge fails to build mld queries, because it has no
ipv6 address, it slilently returns, but keeps the local querier enabled.
This specific case causes confusing packet loss.

Ipv6 multicast snooping can only work if:
 a) An external querier is present
 OR
 b) The bridge has an ipv6 address an is capable of sending own queries

Otherwise it has to forward/flood the ipv6 multicast traffic,
because snooping cannot work.

This patch fixes the issue by adding a flag to the bridge struct that
indicates that there is currently no ipv6 address assinged to the bridge
and returns a false state for the local querier in
__br_multicast_querier_exists().

Special thanks to Linus Lüssing.

Fixes: d1d81d4c3d ("bridge: check return value of ipv6_dev_get_saddr()")
Signed-off-by: Daniel Danzberger <daniel@dd-wrt.com>
Acked-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-07-11 09:31:11 -07:00
..
netfilter netfilter: remove hook owner refcounting 2015-10-16 18:21:39 +02:00
br.c switchdev: Require RTNL mutex to be held when sending FDB notifications 2016-03-03 15:07:04 -08:00
br_device.c bridge: fix lockdep addr_list_lock false positive splat 2016-01-31 11:29:01 -08:00
br_fdb.c bridge: Don't insert unnecessary local fdb entry on changing mac address 2016-06-24 10:18:17 -07:00
br_forward.c bridge: set is_local and is_static before fdb entry is added to the fdb hashtable 2015-10-30 12:13:05 +09:00
br_if.c bridge: defer switchdev fdb del call in fdb_del_external_learn 2015-10-15 06:09:50 -07:00
br_input.c bridge: vlan: use proper rcu for the vlgrp member 2015-10-13 04:57:52 -07:00
br_ioctl.c net: bridge: fix old ioctl unlocked net device walk 2016-05-18 17:06:42 -07:00
br_mdb.c bridge: vlan: add per-vlan struct and move to rhashtables 2015-09-29 13:36:06 -07:00
br_multicast.c Bridge: Fix ipv6 mc snooping if bridge has no ipv6 address 2016-07-11 09:31:11 -07:00
br_netfilter_hooks.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2015-10-17 14:28:03 +02:00
br_netfilter_ipv6.c bridge: Pass net into br_validate_ipv4 and br_validate_ipv6 2015-09-29 20:21:32 +02:00
br_netlink.c netlink: Rightsize IFLA_AF_SPEC size calculation 2015-10-21 19:15:20 -07:00
br_nf_core.c net: Remove protocol from struct dst_ops 2015-03-09 16:06:10 -04:00
br_private.h Bridge: Fix ipv6 mc snooping if bridge has no ipv6 address 2016-07-11 09:31:11 -07:00
br_private_stp.h net: 8021q/bluetooth/bridge/can/ceph: Remove extern from function prototypes 2013-10-19 19:12:11 -04:00
br_stp.c bridge: Allow set bridge ageing time when switchdev disabled 2016-04-20 15:42:05 +09:00
br_stp_bpdu.c netfilter: Pass net into okfn 2015-09-17 17:18:37 -07:00
br_stp_if.c bridge: Only call /sbin/bridge-stp for the initial network namespace 2016-01-05 16:46:17 -05:00
br_stp_timer.c bridge: stp: when using userspace stp stop kernel hello and hold timers 2015-07-28 23:33:20 -07:00
br_sysfs_br.c bridge: fix gc_timer mod/del race condition 2015-10-13 04:50:17 -07:00
br_sysfs_if.c bridge: vlan: flush the dynamically learned entries on port vlan delete 2015-06-24 05:40:55 -07:00
br_vlan.c bridge: vlan: Use rcu_dereference instead of rtnl_dereference 2015-11-02 16:27:39 -05:00
Kconfig bridge: Add vlan filtering infrastructure 2013-02-13 19:41:46 -05:00
Makefile netfilter: bridge: split ipv6 code into separated file 2015-06-18 21:14:21 +02:00